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,Gauss’ and Weber’s “Atlas of Geomagnetism” (1840) Was not the first: the History of the Geomagneticin 1776; its author was the mathematician, cartographer, and astronomer Samuel Dunn, whose aim had been to ameliorate the navigation especially to support the trading of England with the East Indies. The American John Churchman, however, was mainly surveyor; his magnetic atlas was published in four
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On Distortion of Raster-Based Least-Cost CorridorsIt is found that raster-based least-cost corridors, too, are subject to all three types of distortion but in different ways: elongation distortion is always persistent, deviation distortion can be substantially reduced, and proximity distortion can be essentially eliminated.
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